Number of directed EG-convex polyominoes on the honeycomb lattice with given semiperimeter.

Terms

a(0) =1a(1) =0a(2) =3a(3) =2a(4) =9a(5) =12a(6) =31a(7) =53a(8) =116a(9) =215a(10) =446a(11) =849a(12) =1726a(13) =3320a(14) =6688a(15) =12932a(16) =25925a(17) =50297a(18) =100546a(19) =195562a(20) =390257a(21) =760630a(22) =1516233a(23) =2960502a(24) =5897425a(25) =11533047a(26) =22964739a(27) =44972711a(28) =89528901a(29) =175546608